Repeatability and normal values for measurement of pharyngeal and tracheal pressures in exercising horses.

This research tests the consistency of measurements of tracheal and pharyngeal pressures in horses during exercise and confirms that this could be a useful tool in assessing the health of the upper respiratory tract in horses.

Overview of the Study

• The research focused on the repeatability of specific pressure measurements (peak and mean) in the trachea and pharynx of horses that were exercising.
• Five physically fit horses were used for the exercise trials and each was subjected to multiple standardized exercise trials.
• The study gathered static pressures at three locations: the trachea, nasopharynx, and mask.
• The researchers concluded that measuring tracheal and pharyngeal pressures could be a helpful tool for assessing the health of the respiratory tract in horses.

Findings from the Study

• The research demonstrated that the majority of mean pressure measurements (96%) were within 5 cm of H2O of any horse’s average measurement.
• Peak pressure measurements were less consistent, with at least 96% of all measurements being within 10 cm of H2O of any horse’s average peak measurement.
• The study also assessed ten horses galloping at a speed of 14 meters per second. During this exercise, the confidence interval for peak tracheal and pharyngeal inspiratory pressures ranged between -40 to -50 cm of H2O and -20 to -26 cm of H2O respectively.
• During expiration, the confidence interval for peak tracheal and pharyngeal pressures at the same speed hovered between 15 to 28 cm of H2O and 10 to 24 cm of H2O respectively.
• Interestingly, in horses with induced laryngeal hemiplegia, static pressure measurements primarily fell outside of this range during the inspiration process.

Significance of the Research

• The findings demonstrate the repeatability of tracheal and pharyngeal pressure measurements in exercising horses, thereby making this a reliable method for qualitative assessment in horses.
• The study’s findings may lead to a new way of measuring the health of a horse, particularly their respiratory tract.
• Furthermore, the study notes that measurements differ for horses with laryngeal hemiplegia – a disorder affecting a horse’s throat – suggesting that such measurements can be beneficial in detecting potential health issues.